<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
//                                                             //
// getid3.lib.php - part of getID3()                           //
// See readme.txt for more details                             //
//                                                            ///
/////////////////////////////////////////////////////////////////


class getid3_lib
{

    public static function PrintHexBytes($string, $hex = true, $spaces = true, $htmlencoding = 'UTF-8')
    {
        $returnstring = '';
        for ($i = 0; $i < strlen($string); $i++) {
            if ($hex) {
                $returnstring .= str_pad(dechex(ord($string{$i})), 2, '0', STR_PAD_LEFT);
            } else {
                $returnstring .= ' ' . (preg_match("#[\x20-\x7E]#", $string{$i}) ? $string{$i} : '¤');
            }
            if ($spaces) {
                $returnstring .= ' ';
            }
        }
        if (!empty($htmlencoding)) {
            if ($htmlencoding === true) {
                $htmlencoding = 'UTF-8'; // prior to getID3 v1.9.0 the function's 4th parameter was boolean
            }
            $returnstring = htmlentities($returnstring, ENT_QUOTES, $htmlencoding);
        }
        return $returnstring;
    }

    public static function trunc($floatnumber)
    {
        // truncates a floating-point number at the decimal point
        // returns int (if possible, otherwise float)
        if ($floatnumber >= 1) {
            $truncatednumber = floor($floatnumber);
        } elseif ($floatnumber <= -1) {
            $truncatednumber = ceil($floatnumber);
        } else {
            $truncatednumber = 0;
        }
        if (self::intValueSupported($truncatednumber)) {
            $truncatednumber = (int)$truncatednumber;
        }
        return $truncatednumber;
    }


    public static function safe_inc(&$variable, $increment = 1)
    {
        if (isset($variable)) {
            $variable += $increment;
        } else {
            $variable = $increment;
        }
        return true;
    }

    public static function CastAsInt($floatnum)
    {
        // convert to float if not already
        $floatnum = (float)$floatnum;

        // convert a float to type int, only if possible
        if (self::trunc($floatnum) == $floatnum) {
            // it's not floating point
            if (self::intValueSupported($floatnum)) {
                // it's within int range
                $floatnum = (int)$floatnum;
            }
        }
        return $floatnum;
    }

    public static function intValueSupported($num)
    {
        // check if integers are 64-bit
        static $hasINT64 = null;
        if ($hasINT64 === null) { // 10x faster than is_null()
            $hasINT64 = is_int(pow(2, 31)); // 32-bit int are limited to (2^31)-1
            if (!$hasINT64 && !defined('PHP_INT_MIN')) {
                define('PHP_INT_MIN', ~PHP_INT_MAX);
            }
        }
        // if integers are 64-bit - no other check required
        if ($hasINT64 || (($num <= PHP_INT_MAX) && ($num >= PHP_INT_MIN))) {
            return true;
        }
        return false;
    }

    public static function DecimalizeFraction($fraction)
    {
        list($numerator, $denominator) = explode('/', $fraction);
        return $numerator / ($denominator ? $denominator : 1);
    }


    public static function DecimalBinary2Float($binarynumerator)
    {
        $numerator = self::Bin2Dec($binarynumerator);
        $denominator = self::Bin2Dec('1' . str_repeat('0', strlen($binarynumerator)));
        return ($numerator / $denominator);
    }


    public static function NormalizeBinaryPoint($binarypointnumber, $maxbits = 52)
    {
        // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
        if (strpos($binarypointnumber, '.') === false) {
            $binarypointnumber = '0.' . $binarypointnumber;
        } elseif ($binarypointnumber{0} == '.') {
            $binarypointnumber = '0' . $binarypointnumber;
        }
        $exponent = 0;
        while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) {
            if (substr($binarypointnumber, 1, 1) == '.') {
                $exponent--;
                $binarypointnumber = substr($binarypointnumber, 2, 1) . '.' . substr($binarypointnumber, 3);
            } else {
                $pointpos = strpos($binarypointnumber, '.');
                $exponent += ($pointpos - 1);
                $binarypointnumber = str_replace('.', '', $binarypointnumber);
                $binarypointnumber = $binarypointnumber{0} . '.' . substr($binarypointnumber, 1);
            }
        }
        $binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT);
        return array('normalized' => $binarypointnumber, 'exponent' => (int)$exponent);
    }


    public static function Float2BinaryDecimal($floatvalue)
    {
        // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html
        $maxbits = 128; // to how many bits of precision should the calculations be taken?
        $intpart = self::trunc($floatvalue);
        $floatpart = abs($floatvalue - $intpart);
        $pointbitstring = '';
        while (($floatpart != 0) && (strlen($pointbitstring) < $maxbits)) {
            $floatpart *= 2;
            $pointbitstring .= (string)self::trunc($floatpart);
            $floatpart -= self::trunc($floatpart);
        }
        $binarypointnumber = decbin($intpart) . '.' . $pointbitstring;
        return $binarypointnumber;
    }


    public static function Float2String($floatvalue, $bits)
    {
        // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee-expl.html
        switch ($bits) {
            case 32:
                $exponentbits = 8;
                $fractionbits = 23;
                break;

            case 64:
                $exponentbits = 11;
                $fractionbits = 52;
                break;

            default:
                return false;
                break;
        }
        if ($floatvalue >= 0) {
            $signbit = '0';
        } else {
            $signbit = '1';
        }
        $normalizedbinary = self::NormalizeBinaryPoint(self::Float2BinaryDecimal($floatvalue), $fractionbits);
        $biasedexponent = pow(2, $exponentbits - 1) - 1 + $normalizedbinary['exponent']; // (127 or 1023) +/- exponent
        $exponentbitstring = str_pad(decbin($biasedexponent), $exponentbits, '0', STR_PAD_LEFT);
        $fractionbitstring = str_pad(substr($normalizedbinary['normalized'], 2), $fractionbits, '0', STR_PAD_RIGHT);

        return self::BigEndian2String(self::Bin2Dec($signbit . $exponentbitstring . $fractionbitstring), $bits % 8, false);
    }


    public static function LittleEndian2Float($byteword)
    {
        return self::BigEndian2Float(strrev($byteword));
    }


    public static function BigEndian2Float($byteword)
    {
        // ANSI/IEEE Standard 754-1985, Standard for Binary Floating Point Arithmetic
        // http://www.psc.edu/general/software/packages/ieee/ieee.html
        // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/ieee.html

        $bitword = self::BigEndian2Bin($byteword);
        if (!$bitword) {
            return 0;
        }
        $signbit = $bitword{0};

        switch (strlen($byteword) * 8) {
            case 32:
                $exponentbits = 8;
                $fractionbits = 23;
                break;

            case 64:
                $exponentbits = 11;
                $fractionbits = 52;
                break;

            case 80:
                // 80-bit Apple SANE format
                // http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
                $exponentstring = substr($bitword, 1, 15);
                $isnormalized = intval($bitword{16});
                $fractionstring = substr($bitword, 17, 63);
                $exponent = pow(2, self::Bin2Dec($exponentstring) - 16383);
                $fraction = $isnormalized + self::DecimalBinary2Float($fractionstring);
                $floatvalue = $exponent * $fraction;
                if ($signbit == '1') {
                    $floatvalue *= -1;
                }
                return $floatvalue;
                break;

            default:
                return false;
                break;
        }
        $exponentstring = substr($bitword, 1, $exponentbits);
        $fractionstring = substr($bitword, $exponentbits + 1, $fractionbits);
        $exponent = self::Bin2Dec($exponentstring);
        $fraction = self::Bin2Dec($fractionstring);

        if (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction != 0)) {
            // Not a Number
            $floatvalue = false;
        } elseif (($exponent == (pow(2, $exponentbits) - 1)) && ($fraction == 0)) {
            if ($signbit == '1') {
                $floatvalue = '-infinity';
            } else {
                $floatvalue = '+infinity';
            }
        } elseif (($exponent == 0) && ($fraction == 0)) {
            if ($signbit == '1') {
                $floatvalue = -0;
            } else {
                $floatvalue = 0;
            }
            $floatvalue = ($signbit ? 0 : -0);
        } elseif (($exponent == 0) && ($fraction != 0)) {
            // These are 'unnormalized' values
            $floatvalue = pow(2, (-1 * (pow(2, $exponentbits - 1) - 2))) * self::DecimalBinary2Float($fractionstring);
            if ($signbit == '1') {
                $floatvalue *= -1;
            }
        } elseif ($exponent != 0) {
            $floatvalue = pow(2, ($exponent - (pow(2, $exponentbits - 1) - 1))) * (1 + self::DecimalBinary2Float($fractionstring));
            if ($signbit == '1') {
                $floatvalue *= -1;
            }
        }
        return (float)$floatvalue;
    }


    public static function BigEndian2Int($byteword, $synchsafe = false, $signed = false)
    {
        $intvalue = 0;
        $bytewordlen = strlen($byteword);
        if ($bytewordlen == 0) {
            return false;
        }
        for ($i = 0; $i < $bytewordlen; $i++) {
            if ($synchsafe) { // disregard MSB, effectively 7-bit bytes
                //$intvalue = $intvalue | (ord($byteword{$i}) & 0x7F) << (($bytewordlen - 1 - $i) * 7); // faster, but runs into problems past 2^31 on 32-bit systems
                $intvalue += (ord($byteword{$i}) & 0x7F) * pow(2, ($bytewordlen - 1 - $i) * 7);
            } else {
                $intvalue += ord($byteword{$i}) * pow(256, ($bytewordlen - 1 - $i));
            }
        }
        if ($signed && !$synchsafe) {
            // synchsafe ints are not allowed to be signed
            if ($bytewordlen <= PHP_INT_SIZE) {
                $signMaskBit = 0x80 << (8 * ($bytewordlen - 1));
                if ($intvalue & $signMaskBit) {
                    $intvalue = 0 - ($intvalue & ($signMaskBit - 1));
                }
            } else {
                throw new Exception('ERROR: Cannot have signed integers larger than ' . (8 * PHP_INT_SIZE) . '-bits (' . strlen($byteword) . ') in self::BigEndian2Int()');
                break;
            }
        }
        return self::CastAsInt($intvalue);
    }


    public static function LittleEndian2Int($byteword, $signed = false)
    {
        return self::BigEndian2Int(strrev($byteword), false, $signed);
    }


    public static function BigEndian2Bin($byteword)
    {
        $binvalue = '';
        $bytewordlen = strlen($byteword);
        for ($i = 0; $i < $bytewordlen; $i++) {
            $binvalue .= str_pad(decbin(ord($byteword{$i})), 8, '0', STR_PAD_LEFT);
        }
        return $binvalue;
    }


    public static function BigEndian2String($number, $minbytes = 1, $synchsafe = false, $signed = false)
    {
        if ($number < 0) {
            throw new Exception('ERROR: self::BigEndian2String() does not support negative numbers');
        }
        $maskbyte = (($synchsafe || $signed) ? 0x7F : 0xFF);
        $intstring = '';
        if ($signed) {
            if ($minbytes > PHP_INT_SIZE) {
                throw new Exception('ERROR: Cannot have signed integers larger than ' . (8 * PHP_INT_SIZE) . '-bits in self::BigEndian2String()');
            }
            $number = $number & (0x80 << (8 * ($minbytes - 1)));
        }
        while ($number != 0) {
            $quotient = ($number / ($maskbyte + 1));
            $intstring = chr(ceil(($quotient - floor($quotient)) * $maskbyte)) . $intstring;
            $number = floor($quotient);
        }
        return str_pad($intstring, $minbytes, "\x00", STR_PAD_LEFT);
    }


    public static function Dec2Bin($number)
    {
        while ($number >= 256) {
            $bytes[] = (($number / 256) - (floor($number / 256))) * 256;
            $number = floor($number / 256);
        }
        $bytes[] = $number;
        $binstring = '';
        for ($i = 0; $i < count($bytes); $i++) {
            $binstring = (($i == count($bytes) - 1) ? decbin($bytes[$i]) : str_pad(decbin($bytes[$i]), 8, '0', STR_PAD_LEFT)) . $binstring;
        }
        return $binstring;
    }


    public static function Bin2Dec($binstring, $signed = false)
    {
        $signmult = 1;
        if ($signed) {
            if ($binstring{0} == '1') {
                $signmult = -1;
            }
            $binstring = substr($binstring, 1);
        }
        $decvalue = 0;
        for ($i = 0; $i < strlen($binstring); $i++) {
            $decvalue += ((int)substr($binstring, strlen($binstring) - $i - 1, 1)) * pow(2, $i);
        }
        return self::CastAsInt($decvalue * $signmult);
    }


    public static function Bin2String($binstring)
    {
        // return 'hi' for input of '0110100001101001'
        $string = '';
        $binstringreversed = strrev($binstring);
        for ($i = 0; $i < strlen($binstringreversed); $i += 8) {
            $string = chr(self::Bin2Dec(strrev(substr($binstringreversed, $i, 8)))) . $string;
        }
        return $string;
    }


    public static function LittleEndian2String($number, $minbytes = 1, $synchsafe = false)
    {
        $intstring = '';
        while ($number > 0) {
            if ($synchsafe) {
                $intstring = $intstring . chr($number & 127);
                $number >>= 7;
            } else {
                $intstring = $intstring . chr($number & 255);
                $number >>= 8;
            }
        }
        return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);
    }


    public static function array_merge_clobber($array1, $array2)
    {
        // written by kcØhireability*com
        // taken from http://www.php.net/manual/en/function.array-merge-recursive.php
        if (!is_array($array1) || !is_array($array2)) {
            return false;
        }
        $newarray = $array1;
        foreach ($array2 as $key => $val) {
            if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
                $newarray[$key] = self::array_merge_clobber($newarray[$key], $val);
            } else {
                $newarray[$key] = $val;
            }
        }
        return $newarray;
    }


    public static function array_merge_noclobber($array1, $array2)
    {
        if (!is_array($array1) || !is_array($array2)) {
            return false;
        }
        $newarray = $array1;
        foreach ($array2 as $key => $val) {
            if (is_array($val) && isset($newarray[$key]) && is_array($newarray[$key])) {
                $newarray[$key] = self::array_merge_noclobber($newarray[$key], $val);
            } elseif (!isset($newarray[$key])) {
                $newarray[$key] = $val;
            }
        }
        return $newarray;
    }


    public static function ksort_recursive(&$theArray)
    {
        ksort($theArray);
        foreach ($theArray as $key => $value) {
            if (is_array($value)) {
                self::ksort_recursive($theArray[$key]);
            }
        }
        return true;
    }

    public static function fileextension($filename, $numextensions = 1)
    {
        if (strstr($filename, '.')) {
            $reversedfilename = strrev($filename);
            $offset = 0;
            for ($i = 0; $i < $numextensions; $i++) {
                $offset = strpos($reversedfilename, '.', $offset + 1);
                if ($offset === false) {
                    return '';
                }
            }
            return strrev(substr($reversedfilename, 0, $offset));
        }
        return '';
    }


    public static function PlaytimeString($seconds)
    {
        $sign = (($seconds < 0) ? '-' : '');
        $seconds = round(abs($seconds));
        $H = (int)floor($seconds / 3600);
        $M = (int)floor(($seconds - (3600 * $H)) / 60);
        $S = (int)round($seconds - (3600 * $H) - (60 * $M));
        return $sign . ($H ? $H . ':' : '') . ($H ? str_pad($M, 2, '0', STR_PAD_LEFT) : intval($M)) . ':' . str_pad($S, 2, 0, STR_PAD_LEFT);
    }


    public static function DateMac2Unix($macdate)
    {
        // Macintosh timestamp: seconds since 00:00h January 1, 1904
        // UNIX timestamp:      seconds since 00:00h January 1, 1970
        return self::CastAsInt($macdate - 2082844800);
    }


    public static function FixedPoint8_8($rawdata)
    {
        return self::BigEndian2Int(substr($rawdata, 0, 1)) + (float)(self::BigEndian2Int(substr($rawdata, 1, 1)) / pow(2, 8));
    }


    public static function FixedPoint16_16($rawdata)
    {
        return self::BigEndian2Int(substr($rawdata, 0, 2)) + (float)(self::BigEndian2Int(substr($rawdata, 2, 2)) / pow(2, 16));
    }


    public static function FixedPoint2_30($rawdata)
    {
        $binarystring = self::BigEndian2Bin($rawdata);
        return self::Bin2Dec(substr($binarystring, 0, 2)) + (float)(self::Bin2Dec(substr($binarystring, 2, 30)) / pow(2, 30));
    }


    public static function CreateDeepArray($ArrayPath, $Separator, $Value)
    {
        // assigns $Value to a nested array path:
        //   $foo = self::CreateDeepArray('/path/to/my', '/', 'file.txt')
        // is the same as:
        //   $foo = array('path'=>array('to'=>'array('my'=>array('file.txt'))));
        // or
        //   $foo['path']['to']['my'] = 'file.txt';
        $ArrayPath = ltrim($ArrayPath, $Separator);
        if (($pos = strpos($ArrayPath, $Separator)) !== false) {
            $ReturnedArray[substr($ArrayPath, 0, $pos)] = self::CreateDeepArray(substr($ArrayPath, $pos + 1), $Separator, $Value);
        } else {
            $ReturnedArray[$ArrayPath] = $Value;
        }
        return $ReturnedArray;
    }

    public static function array_max($arraydata, $returnkey = false)
    {
        $maxvalue = false;
        $maxkey = false;
        foreach ($arraydata as $key => $value) {
            if (!is_array($value)) {
                if ($value > $maxvalue) {
                    $maxvalue = $value;
                    $maxkey = $key;
                }
            }
        }
        return ($returnkey ? $maxkey : $maxvalue);
    }

    public static function array_min($arraydata, $returnkey = false)
    {
        $minvalue = false;
        $minkey = false;
        foreach ($arraydata as $key => $value) {
            if (!is_array($value)) {
                if ($value > $minvalue) {
                    $minvalue = $value;
                    $minkey = $key;
                }
            }
        }
        return ($returnkey ? $minkey : $minvalue);
    }

    public static function XML2array($XMLstring)
    {
        if (function_exists('simplexml_load_string')) {
            if (function_exists('get_object_vars')) {
                $XMLobject = simplexml_load_string($XMLstring);
                return self::SimpleXMLelement2array($XMLobject);
            }
        }
        return false;
    }

    public static function SimpleXMLelement2array($XMLobject)
    {
        if (!is_object($XMLobject) && !is_array($XMLobject)) {
            return $XMLobject;
        }
        $XMLarray = (is_object($XMLobject) ? get_object_vars($XMLobject) : $XMLobject);
        foreach ($XMLarray as $key => $value) {
            $XMLarray[$key] = self::SimpleXMLelement2array($value);
        }
        return $XMLarray;
    }


    // Allan Hansen <ahØartemis*dk>
    // self::md5_data() - returns md5sum for a file from startuing position to absolute end position
    public static function hash_data($file, $offset, $end, $algorithm)
    {
        static $tempdir = '';
        if (!self::intValueSupported($end)) {
            return false;
        }
        switch ($algorithm) {
            case 'md5':
                $hash_function = 'md5_file';
                $unix_call = 'md5sum';
                $windows_call = 'md5sum.exe';
                $hash_length = 32;
                break;

            case 'sha1':
                $hash_function = 'sha1_file';
                $unix_call = 'sha1sum';
                $windows_call = 'sha1sum.exe';
                $hash_length = 40;
                break;

            default:
                throw new Exception('Invalid algorithm (' . $algorithm . ') in self::hash_data()');
                break;
        }
        $size = $end - $offset;
        while (true) {
            if (GETID3_OS_ISWINDOWS) {

                // It seems that sha1sum.exe for Windows only works on physical files, does not accept piped data
                // Fall back to create-temp-file method:
                if ($algorithm == 'sha1') {
                    break;
                }

                $RequiredFiles = array('cygwin1.dll', 'head.exe', 'tail.exe', $windows_call);
                foreach ($RequiredFiles as $required_file) {
                    if (!is_readable(GETID3_HELPERAPPSDIR . $required_file)) {
                        // helper apps not available - fall back to old method
                        break 2;
                    }
                }
                $commandline = GETID3_HELPERAPPSDIR . 'head.exe -c ' . $end . ' ' . escapeshellarg(str_replace('/', DIRECTORY_SEPARATOR, $file)) . ' | ';
                $commandline .= GETID3_HELPERAPPSDIR . 'tail.exe -c ' . $size . ' | ';
                $commandline .= GETID3_HELPERAPPSDIR . $windows_call;

            } else {

                $commandline = 'head -c' . $end . ' ' . escapeshellarg($file) . ' | ';
                $commandline .= 'tail -c' . $size . ' | ';
                $commandline .= $unix_call;

            }
            if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) {
                //throw new Exception('PHP running in Safe Mode - backtick operator not available, using slower non-system-call '.$algorithm.' algorithm');
                break;
            }
            return substr(`$commandline`, 0, $hash_length);
        }

        if (empty($tempdir)) {
            // yes this is ugly, feel free to suggest a better way
            require_once(dirname(__FILE__) . '/getid3.php');
            $getid3_temp = new getID3();
            $tempdir = $getid3_temp->tempdir;
            unset($getid3_temp);
        }
        // try to create a temporary file in the system temp directory - invalid dirname should force to system temp dir
        if (($data_filename = tempnam($tempdir, 'gI3')) === false) {
            // can't find anywhere to create a temp file, just fail
            return false;
        }

        // Init
        $result = false;

        // copy parts of file
        try {
            self::CopyFileParts($file, $data_filename, $offset, $end - $offset);
            $result = $hash_function($data_filename);
        } catch (Exception $e) {
            throw new Exception('self::CopyFileParts() failed in getid_lib::hash_data(): ' . $e->getMessage());
        }
        unlink($data_filename);
        return $result;
    }

    public static function CopyFileParts($filename_source, $filename_dest, $offset, $length)
    {
        if (!self::intValueSupported($offset + $length)) {
            throw new Exception('cannot copy file portion, it extends beyond the ' . round(PHP_INT_MAX / 1073741824) . 'GB limit');
        }
        if (is_readable($filename_source) && is_file($filename_source) && ($fp_src = fopen($filename_source, 'rb'))) {
            if (($fp_dest = fopen($filename_dest, 'wb'))) {
                if (fseek($fp_src, $offset, SEEK_SET) == 0) {
                    $byteslefttowrite = $length;
                    while (($byteslefttowrite > 0) && ($buffer = fread($fp_src, min($byteslefttowrite, getID3::FREAD_BUFFER_SIZE)))) {
                        $byteswritten = fwrite($fp_dest, $buffer, $byteslefttowrite);
                        $byteslefttowrite -= $byteswritten;
                    }
                    return true;
                } else {
                    throw new Exception('failed to seek to offset ' . $offset . ' in ' . $filename_source);
                }
                fclose($fp_dest);
            } else {
                throw new Exception('failed to create file for writing ' . $filename_dest);
            }
            fclose($fp_src);
        } else {
            throw new Exception('failed to open file for reading ' . $filename_source);
        }
        return false;
    }

    public static function iconv_fallback_int_utf8($charval)
    {
        if ($charval < 128) {
            // 0bbbbbbb
            $newcharstring = chr($charval);
        } elseif ($charval < 2048) {
            // 110bbbbb 10bbbbbb
            $newcharstring = chr(($charval >> 6) | 0xC0);
            $newcharstring .= chr(($charval & 0x3F) | 0x80);
        } elseif ($charval < 65536) {
            // 1110bbbb 10bbbbbb 10bbbbbb
            $newcharstring = chr(($charval >> 12) | 0xE0);
            $newcharstring .= chr(($charval >> 6) | 0xC0);
            $newcharstring .= chr(($charval & 0x3F) | 0x80);
        } else {
            // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
            $newcharstring = chr(($charval >> 18) | 0xF0);
            $newcharstring .= chr(($charval >> 12) | 0xC0);
            $newcharstring .= chr(($charval >> 6) | 0xC0);
            $newcharstring .= chr(($charval & 0x3F) | 0x80);
        }
        return $newcharstring;
    }

    // ISO-8859-1 => UTF-8
    public static function iconv_fallback_iso88591_utf8($string, $bom = false)
    {
        if (function_exists('utf8_encode')) {
            return utf8_encode($string);
        }
        // utf8_encode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
        $newcharstring = '';
        if ($bom) {
            $newcharstring .= "\xEF\xBB\xBF";
        }
        for ($i = 0; $i < strlen($string); $i++) {
            $charval = ord($string{$i});
            $newcharstring .= self::iconv_fallback_int_utf8($charval);
        }
        return $newcharstring;
    }

    // ISO-8859-1 => UTF-16BE
    public static function iconv_fallback_iso88591_utf16be($string, $bom = false)
    {
        $newcharstring = '';
        if ($bom) {
            $newcharstring .= "\xFE\xFF";
        }
        for ($i = 0; $i < strlen($string); $i++) {
            $newcharstring .= "\x00" . $string{$i};
        }
        return $newcharstring;
    }

    // ISO-8859-1 => UTF-16LE
    public static function iconv_fallback_iso88591_utf16le($string, $bom = false)
    {
        $newcharstring = '';
        if ($bom) {
            $newcharstring .= "\xFF\xFE";
        }
        for ($i = 0; $i < strlen($string); $i++) {
            $newcharstring .= $string{$i} . "\x00";
        }
        return $newcharstring;
    }

    // ISO-8859-1 => UTF-16LE (BOM)
    public static function iconv_fallback_iso88591_utf16($string)
    {
        return self::iconv_fallback_iso88591_utf16le($string, true);
    }

    // UTF-8 => ISO-8859-1
    public static function iconv_fallback_utf8_iso88591($string)
    {
        if (function_exists('utf8_decode')) {
            return utf8_decode($string);
        }
        // utf8_decode() unavailable, use getID3()'s iconv_fallback() conversions (possibly PHP is compiled without XML support)
        $newcharstring = '';
        $offset = 0;
        $stringlength = strlen($string);
        while ($offset < $stringlength) {
            if ((ord($string{$offset}) | 0x07) == 0xF7) {
                // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
                    ((ord($string{($offset + 1)}) & 0x3F) << 12) &
                    ((ord($string{($offset + 2)}) & 0x3F) << 6) &
                    (ord($string{($offset + 3)}) & 0x3F);
                $offset += 4;
            } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
                // 1110bbbb 10bbbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
                    ((ord($string{($offset + 1)}) & 0x3F) << 6) &
                    (ord($string{($offset + 2)}) & 0x3F);
                $offset += 3;
            } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
                // 110bbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x1F) << 6) &
                    (ord($string{($offset + 1)}) & 0x3F);
                $offset += 2;
            } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
                // 0bbbbbbb
                $charval = ord($string{$offset});
                $offset += 1;
            } else {
                // error? throw some kind of warning here?
                $charval = false;
                $offset += 1;
            }
            if ($charval !== false) {
                $newcharstring .= (($charval < 256) ? chr($charval) : '?');
            }
        }
        return $newcharstring;
    }

    // UTF-8 => UTF-16BE
    public static function iconv_fallback_utf8_utf16be($string, $bom = false)
    {
        $newcharstring = '';
        if ($bom) {
            $newcharstring .= "\xFE\xFF";
        }
        $offset = 0;
        $stringlength = strlen($string);
        while ($offset < $stringlength) {
            if ((ord($string{$offset}) | 0x07) == 0xF7) {
                // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
                    ((ord($string{($offset + 1)}) & 0x3F) << 12) &
                    ((ord($string{($offset + 2)}) & 0x3F) << 6) &
                    (ord($string{($offset + 3)}) & 0x3F);
                $offset += 4;
            } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
                // 1110bbbb 10bbbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
                    ((ord($string{($offset + 1)}) & 0x3F) << 6) &
                    (ord($string{($offset + 2)}) & 0x3F);
                $offset += 3;
            } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
                // 110bbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x1F) << 6) &
                    (ord($string{($offset + 1)}) & 0x3F);
                $offset += 2;
            } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
                // 0bbbbbbb
                $charval = ord($string{$offset});
                $offset += 1;
            } else {
                // error? throw some kind of warning here?
                $charval = false;
                $offset += 1;
            }
            if ($charval !== false) {
                $newcharstring .= (($charval < 65536) ? self::BigEndian2String($charval, 2) : "\x00" . '?');
            }
        }
        return $newcharstring;
    }

    // UTF-8 => UTF-16LE
    public static function iconv_fallback_utf8_utf16le($string, $bom = false)
    {
        $newcharstring = '';
        if ($bom) {
            $newcharstring .= "\xFF\xFE";
        }
        $offset = 0;
        $stringlength = strlen($string);
        while ($offset < $stringlength) {
            if ((ord($string{$offset}) | 0x07) == 0xF7) {
                // 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x07) << 18) &
                    ((ord($string{($offset + 1)}) & 0x3F) << 12) &
                    ((ord($string{($offset + 2)}) & 0x3F) << 6) &
                    (ord($string{($offset + 3)}) & 0x3F);
                $offset += 4;
            } elseif ((ord($string{$offset}) | 0x0F) == 0xEF) {
                // 1110bbbb 10bbbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x0F) << 12) &
                    ((ord($string{($offset + 1)}) & 0x3F) << 6) &
                    (ord($string{($offset + 2)}) & 0x3F);
                $offset += 3;
            } elseif ((ord($string{$offset}) | 0x1F) == 0xDF) {
                // 110bbbbb 10bbbbbb
                $charval = ((ord($string{($offset + 0)}) & 0x1F) << 6) &
                    (ord($string{($offset + 1)}) & 0x3F);
                $offset += 2;
            } elseif ((ord($string{$offset}) | 0x7F) == 0x7F) {
                // 0bbbbbbb
                $charval = ord($string{$offset});
                $offset += 1;
            } else {
                // error? maybe throw some warning here?
                $charval = false;
                $offset += 1;
            }
            if ($charval !== false) {
                $newcharstring .= (($charval < 65536) ? self::LittleEndian2String($charval, 2) : '?' . "\x00");
            }
        }
        return $newcharstring;
    }

    // UTF-8 => UTF-16LE (BOM)
    public static function iconv_fallback_utf8_utf16($string)
    {
        return self::iconv_fallback_utf8_utf16le($string, true);
    }

    // UTF-16BE => UTF-8
    public static function iconv_fallback_utf16be_utf8($string)
    {
        if (substr($string, 0, 2) == "\xFE\xFF") {
            // strip BOM
            $string = substr($string, 2);
        }
        $newcharstring = '';
        for ($i = 0; $i < strlen($string); $i += 2) {
            $charval = self::BigEndian2Int(substr($string, $i, 2));
            $newcharstring .= self::iconv_fallback_int_utf8($charval);
        }
        return $newcharstring;
    }

    // UTF-16LE => UTF-8
    public static function iconv_fallback_utf16le_utf8($string)
    {
        if (substr($string, 0, 2) == "\xFF\xFE") {
            // strip BOM
            $string = substr($string, 2);
        }
        $newcharstring = '';
        for ($i = 0; $i < strlen($string); $i += 2) {
            $charval = self::LittleEndian2Int(substr($string, $i, 2));
            $newcharstring .= self::iconv_fallback_int_utf8($charval);
        }
        return $newcharstring;
    }

    // UTF-16BE => ISO-8859-1
    public static function iconv_fallback_utf16be_iso88591($string)
    {
        if (substr($string, 0, 2) == "\xFE\xFF") {
            // strip BOM
            $string = substr($string, 2);
        }
        $newcharstring = '';
        for ($i = 0; $i < strlen($string); $i += 2) {
            $charval = self::BigEndian2Int(substr($string, $i, 2));
            $newcharstring .= (($charval < 256) ? chr($charval) : '?');
        }
        return $newcharstring;
    }

    // UTF-16LE => ISO-8859-1
    public static function iconv_fallback_utf16le_iso88591($string)
    {
        if (substr($string, 0, 2) == "\xFF\xFE") {
            // strip BOM
            $string = substr($string, 2);
        }
        $newcharstring = '';
        for ($i = 0; $i < strlen($string); $i += 2) {
            $charval = self::LittleEndian2Int(substr($string, $i, 2));
            $newcharstring .= (($charval < 256) ? chr($charval) : '?');
        }
        return $newcharstring;
    }

    // UTF-16 (BOM) => ISO-8859-1
    public static function iconv_fallback_utf16_iso88591($string)
    {
        $bom = substr($string, 0, 2);
        if ($bom == "\xFE\xFF") {
            return self::iconv_fallback_utf16be_iso88591(substr($string, 2));
        } elseif ($bom == "\xFF\xFE") {
            return self::iconv_fallback_utf16le_iso88591(substr($string, 2));
        }
        return $string;
    }

    // UTF-16 (BOM) => UTF-8
    public static function iconv_fallback_utf16_utf8($string)
    {
        $bom = substr($string, 0, 2);
        if ($bom == "\xFE\xFF") {
            return self::iconv_fallback_utf16be_utf8(substr($string, 2));
        } elseif ($bom == "\xFF\xFE") {
            return self::iconv_fallback_utf16le_utf8(substr($string, 2));
        }
        return $string;
    }

    public static function iconv_fallback($in_charset, $out_charset, $string)
    {

        if ($in_charset == $out_charset) {
            return $string;
        }

        // iconv() availble
        if (function_exists('iconv')) {
            if ($converted_string = @iconv($in_charset, $out_charset . '//TRANSLIT', $string)) {
                switch ($out_charset) {
                    case 'ISO-8859-1':
                        $converted_string = rtrim($converted_string, "\x00");
                        break;
                }
                return $converted_string;
            }

            // iconv() may sometimes fail with "illegal character in input string" error message
            // and return an empty string, but returning the unconverted string is more useful
            return $string;
        }


        // iconv() not available
        static $ConversionFunctionList = array();
        if (empty($ConversionFunctionList)) {
            $ConversionFunctionList['ISO-8859-1']['UTF-8'] = 'iconv_fallback_iso88591_utf8';
            $ConversionFunctionList['ISO-8859-1']['UTF-16'] = 'iconv_fallback_iso88591_utf16';
            $ConversionFunctionList['ISO-8859-1']['UTF-16BE'] = 'iconv_fallback_iso88591_utf16be';
            $ConversionFunctionList['ISO-8859-1']['UTF-16LE'] = 'iconv_fallback_iso88591_utf16le';
            $ConversionFunctionList['UTF-8']['ISO-8859-1'] = 'iconv_fallback_utf8_iso88591';
            $ConversionFunctionList['UTF-8']['UTF-16'] = 'iconv_fallback_utf8_utf16';
            $ConversionFunctionList['UTF-8']['UTF-16BE'] = 'iconv_fallback_utf8_utf16be';
            $ConversionFunctionList['UTF-8']['UTF-16LE'] = 'iconv_fallback_utf8_utf16le';
            $ConversionFunctionList['UTF-16']['ISO-8859-1'] = 'iconv_fallback_utf16_iso88591';
            $ConversionFunctionList['UTF-16']['UTF-8'] = 'iconv_fallback_utf16_utf8';
            $ConversionFunctionList['UTF-16LE']['ISO-8859-1'] = 'iconv_fallback_utf16le_iso88591';
            $ConversionFunctionList['UTF-16LE']['UTF-8'] = 'iconv_fallback_utf16le_utf8';
            $ConversionFunctionList['UTF-16BE']['ISO-8859-1'] = 'iconv_fallback_utf16be_iso88591';
            $ConversionFunctionList['UTF-16BE']['UTF-8'] = 'iconv_fallback_utf16be_utf8';
        }
        if (isset($ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)])) {
            $ConversionFunction = $ConversionFunctionList[strtoupper($in_charset)][strtoupper($out_charset)];
            return self::$ConversionFunction($string);
        }
        throw new Exception('PHP does not have iconv() support - cannot convert from ' . $in_charset . ' to ' . $out_charset);
    }


    public static function MultiByteCharString2HTML($string, $charset = 'ISO-8859-1')
    {
        $string = (string)$string; // in case trying to pass a numeric (float, int) string, would otherwise return an empty string
        $HTMLstring = '';

        switch ($charset) {
            case '1251':
            case '1252':
            case '866':
            case '932':
            case '936':
            case '950':
            case 'BIG5':
            case 'BIG5-HKSCS':
            case 'cp1251':
            case 'cp1252':
            case 'cp866':
            case 'EUC-JP':
            case 'EUCJP':
            case 'GB2312':
            case 'ibm866':
            case 'ISO-8859-1':
            case 'ISO-8859-15':
            case 'ISO8859-1':
            case 'ISO8859-15':
            case 'KOI8-R':
            case 'koi8-ru':
            case 'koi8r':
            case 'Shift_JIS':
            case 'SJIS':
            case 'win-1251':
            case 'Windows-1251':
            case 'Windows-1252':
                $HTMLstring = htmlentities($string, ENT_COMPAT, $charset);
                break;

            case 'UTF-8':
                $strlen = strlen($string);
                for ($i = 0; $i < $strlen; $i++) {
                    $char_ord_val = ord($string{$i});
                    $charval = 0;
                    if ($char_ord_val < 0x80) {
                        $charval = $char_ord_val;
                    } elseif ((($char_ord_val & 0xF0) >> 4) == 0x0F && $i + 3 < $strlen) {
                        $charval = (($char_ord_val & 0x07) << 18);
                        $charval += ((ord($string{++$i}) & 0x3F) << 12);
                        $charval += ((ord($string{++$i}) & 0x3F) << 6);
                        $charval += (ord($string{++$i}) & 0x3F);
                    } elseif ((($char_ord_val & 0xE0) >> 5) == 0x07 && $i + 2 < $strlen) {
                        $charval = (($char_ord_val & 0x0F) << 12);
                        $charval += ((ord($string{++$i}) & 0x3F) << 6);
                        $charval += (ord($string{++$i}) & 0x3F);
                    } elseif ((($char_ord_val & 0xC0) >> 6) == 0x03 && $i + 1 < $strlen) {
                        $charval = (($char_ord_val & 0x1F) << 6);
                        $charval += (ord($string{++$i}) & 0x3F);
                    }
                    if (($charval >= 32) && ($charval <= 127)) {
                        $HTMLstring .= htmlentities(chr($charval));
                    } else {
                        $HTMLstring .= '&#' . $charval . ';';
                    }
                }
                break;

            case 'UTF-16LE':
                for ($i = 0; $i < strlen($string); $i += 2) {
                    $charval = self::LittleEndian2Int(substr($string, $i, 2));
                    if (($charval >= 32) && ($charval <= 127)) {
                        $HTMLstring .= chr($charval);
                    } else {
                        $HTMLstring .= '&#' . $charval . ';';
                    }
                }
                break;

            case 'UTF-16BE':
                for ($i = 0; $i < strlen($string); $i += 2) {
                    $charval = self::BigEndian2Int(substr($string, $i, 2));
                    if (($charval >= 32) && ($charval <= 127)) {
                        $HTMLstring .= chr($charval);
                    } else {
                        $HTMLstring .= '&#' . $charval . ';';
                    }
                }
                break;

            default:
                $HTMLstring = 'ERROR: Character set "' . $charset . '" not supported in MultiByteCharString2HTML()';
                break;
        }
        return $HTMLstring;
    }


    public static function RGADnameLookup($namecode)
    {
        static $RGADname = array();
        if (empty($RGADname)) {
            $RGADname[0] = 'not set';
            $RGADname[1] = 'Track Gain Adjustment';
            $RGADname[2] = 'Album Gain Adjustment';
        }

        return (isset($RGADname[$namecode]) ? $RGADname[$namecode] : '');
    }


    public static function RGADoriginatorLookup($originatorcode)
    {
        static $RGADoriginator = array();
        if (empty($RGADoriginator)) {
            $RGADoriginator[0] = 'unspecified';
            $RGADoriginator[1] = 'pre-set by artist/producer/mastering engineer';
            $RGADoriginator[2] = 'set by user';
            $RGADoriginator[3] = 'determined automatically';
        }

        return (isset($RGADoriginator[$originatorcode]) ? $RGADoriginator[$originatorcode] : '');
    }


    public static function RGADadjustmentLookup($rawadjustment, $signbit)
    {
        $adjustment = $rawadjustment / 10;
        if ($signbit == 1) {
            $adjustment *= -1;
        }
        return (float)$adjustment;
    }


    public static function RGADgainString($namecode, $originatorcode, $replaygain)
    {
        if ($replaygain < 0) {
            $signbit = '1';
        } else {
            $signbit = '0';
        }
        $storedreplaygain = intval(round($replaygain * 10));
        $gainstring = str_pad(decbin($namecode), 3, '0', STR_PAD_LEFT);
        $gainstring .= str_pad(decbin($originatorcode), 3, '0', STR_PAD_LEFT);
        $gainstring .= $signbit;
        $gainstring .= str_pad(decbin($storedreplaygain), 9, '0', STR_PAD_LEFT);

        return $gainstring;
    }

    public static function RGADamplitude2dB($amplitude)
    {
        return 20 * log10($amplitude);
    }


    public static function GetDataImageSize($imgData, &$imageinfo = array())
    {
        static $tempdir = '';
        if (empty($tempdir)) {
            // yes this is ugly, feel free to suggest a better way
            require_once(dirname(__FILE__) . '/getid3.php');
            $getid3_temp = new getID3();
            $tempdir = $getid3_temp->tempdir;
            unset($getid3_temp);
        }
        $GetDataImageSize = false;
        if ($tempfilename = tempnam($tempdir, 'gI3')) {
            if (is_writable($tempfilename) && is_file($tempfilename) && ($tmp = fopen($tempfilename, 'wb'))) {
                fwrite($tmp, $imgData);
                fclose($tmp);
                $GetDataImageSize = @getimagesize($tempfilename, $imageinfo);
            }
            unlink($tempfilename);
        }
        return $GetDataImageSize;
    }

    public static function ImageExtFromMime($mime_type)
    {
        // temporary way, works OK for now, but should be reworked in the future
        return str_replace(array('image/', 'x-', 'jpeg'), array('', '', 'jpg'), $mime_type);
    }

    public static function ImageTypesLookup($imagetypeid)
    {
        static $ImageTypesLookup = array();
        if (empty($ImageTypesLookup)) {
            $ImageTypesLookup[1] = 'gif';
            $ImageTypesLookup[2] = 'jpeg';
            $ImageTypesLookup[3] = 'png';
            $ImageTypesLookup[4] = 'swf';
            $ImageTypesLookup[5] = 'psd';
            $ImageTypesLookup[6] = 'bmp';
            $ImageTypesLookup[7] = 'tiff (little-endian)';
            $ImageTypesLookup[8] = 'tiff (big-endian)';
            $ImageTypesLookup[9] = 'jpc';
            $ImageTypesLookup[10] = 'jp2';
            $ImageTypesLookup[11] = 'jpx';
            $ImageTypesLookup[12] = 'jb2';
            $ImageTypesLookup[13] = 'swc';
            $ImageTypesLookup[14] = 'iff';
        }
        return (isset($ImageTypesLookup[$imagetypeid]) ? $ImageTypesLookup[$imagetypeid] : '');
    }

    public static function CopyTagsToComments(&$ThisFileInfo)
    {

        // Copy all entries from ['tags'] into common ['comments']
        if (!empty($ThisFileInfo['tags'])) {
            foreach ($ThisFileInfo['tags'] as $tagtype => $tagarray) {
                foreach ($tagarray as $tagname => $tagdata) {
                    foreach ($tagdata as $key => $value) {
                        if (!empty($value)) {
                            if (empty($ThisFileInfo['comments'][$tagname])) {

                                // fall through and append value

                            } elseif ($tagtype == 'id3v1') {

                                $newvaluelength = strlen(trim($value));
                                foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
                                    $oldvaluelength = strlen(trim($existingvalue));
                                    if (($newvaluelength <= $oldvaluelength) && (substr($existingvalue, 0, $newvaluelength) == trim($value))) {
                                        // new value is identical but shorter-than (or equal-length to) one already in comments - skip
                                        break 2;
                                    }
                                }

                            } elseif (!is_array($value)) {

                                $newvaluelength = strlen(trim($value));
                                foreach ($ThisFileInfo['comments'][$tagname] as $existingkey => $existingvalue) {
                                    $oldvaluelength = strlen(trim($existingvalue));
                                    if (($newvaluelength > $oldvaluelength) && (substr(trim($value), 0, strlen($existingvalue)) == $existingvalue)) {
                                        $ThisFileInfo['comments'][$tagname][$existingkey] = trim($value);
                                        break 2;
                                    }
                                }

                            }
                            if (is_array($value) || empty($ThisFileInfo['comments'][$tagname]) || !in_array(trim($value), $ThisFileInfo['comments'][$tagname])) {
                                $value = (is_string($value) ? trim($value) : $value);
                                $ThisFileInfo['comments'][$tagname][] = $value;
                            }
                        }
                    }
                }
            }

            // Copy to ['comments_html']
            foreach ($ThisFileInfo['comments'] as $field => $values) {
                if ($field == 'picture') {
                    // pictures can take up a lot of space, and we don't need multiple copies of them
                    // let there be a single copy in [comments][picture], and not elsewhere
                    continue;
                }
                foreach ($values as $index => $value) {
                    if (is_array($value)) {
                        $ThisFileInfo['comments_html'][$field][$index] = $value;
                    } else {
                        $ThisFileInfo['comments_html'][$field][$index] = str_replace('&#0;', '', self::MultiByteCharString2HTML($value, $ThisFileInfo['encoding']));
                    }
                }
            }
        }
        return true;
    }


    public static function EmbeddedLookup($key, $begin, $end, $file, $name)
    {

        // Cached
        static $cache;
        if (isset($cache[$file][$name])) {
            return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
        }

        // Init
        $keylength = strlen($key);
        $line_count = $end - $begin - 7;

        // Open php file
        $fp = fopen($file, 'r');

        // Discard $begin lines
        for ($i = 0; $i < ($begin + 3); $i++) {
            fgets($fp, 1024);
        }

        // Loop thru line
        while (0 < $line_count--) {

            // Read line
            $line = ltrim(fgets($fp, 1024), "\t ");

            // METHOD A: only cache the matching key - less memory but slower on next lookup of not-previously-looked-up key
            //$keycheck = substr($line, 0, $keylength);
            //if ($key == $keycheck)  {
            //	$cache[$file][$name][$keycheck] = substr($line, $keylength + 1);
            //	break;
            //}

            // METHOD B: cache all keys in this lookup - more memory but faster on next lookup of not-previously-looked-up key
            //$cache[$file][$name][substr($line, 0, $keylength)] = trim(substr($line, $keylength + 1));
            $explodedLine = explode("\t", $line, 2);
            $ThisKey = (isset($explodedLine[0]) ? $explodedLine[0] : '');
            $ThisValue = (isset($explodedLine[1]) ? $explodedLine[1] : '');
            $cache[$file][$name][$ThisKey] = trim($ThisValue);
        }

        // Close and return
        fclose($fp);
        return (isset($cache[$file][$name][$key]) ? $cache[$file][$name][$key] : '');
    }

    public static function IncludeDependency($filename, $sourcefile, $DieOnFailure = false)
    {
        global $GETID3_ERRORARRAY;

        if (file_exists($filename)) {
            if (include_once($filename)) {
                return true;
            } else {
                $diemessage = basename($sourcefile) . ' depends on ' . $filename . ', which has errors';
            }
        } else {
            $diemessage = basename($sourcefile) . ' depends on ' . $filename . ', which is missing';
        }
        if ($DieOnFailure) {
            throw new Exception($diemessage);
        } else {
            $GETID3_ERRORARRAY[] = $diemessage;
        }
        return false;
    }

    public static function trimNullByte($string)
    {
        return trim($string, "\x00");
    }

    public static function getFileSizeSyscall($path)
    {
        $filesize = false;

        if (GETID3_OS_ISWINDOWS) {
            if (class_exists('COM')) { // From PHP 5.3.15 and 5.4.5, COM and DOTNET is no longer built into the php core.you have to add COM support in php.ini:
                $filesystem = new COM('Scripting.FileSystemObject');
                $file = $filesystem->GetFile($path);
                $filesize = $file->Size();
                unset($filesystem, $file);
            } else {
                $commandline = 'for %I in (' . escapeshellarg($path) . ') do @echo %~zI';
            }
        } else {
            $commandline = 'ls -l ' . escapeshellarg($path) . ' | awk \'{print $5}\'';
        }
        if (isset($commandline)) {
            $output = trim(`$commandline`);
            if (ctype_digit($output)) {
                $filesize = (float)$output;
            }
        }
        return $filesize;
    }
}